Aggiunge newsletter custom con D1, double opt-in e invio campagne.

Attiva il form footer, API subscribe/confirm/unsubscribe e endpoint admin protetti, riusando Resend per le email.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/pages/api/newsletter/confirm.ts

@@ -0,0 +1,85 @@
+import type { APIRoute } from 'astro';
+import {
+  getNewsletterDb,
+  getRuntimeEnv,
+  readEnv,
+  required,
+  sendWithResend,
+  type NewsletterSubscriber,
+} from '../../../lib/newsletter';
+
+export const prerender = false;
+
+export const GET: APIRoute = async ({ request, locals, url }) => {
+  const runtimeEnv = getRuntimeEnv(locals);
+  const mode = (readEnv('NEWSLETTER_MODE', runtimeEnv) || readEnv('CONTACT_FORM_MODE', runtimeEnv) || 'dev').toLowerCase();
+  const token = required(url.searchParams.get('token'));
+  const okPath = '/newsletter/confermata';
+  const failPath = '/newsletter/conferma-errore';
+
+  if (!token) {
+    return Response.redirect(new URL(failPath, url).toString(), 303);
+  }
+
+  if (mode !== 'live') {
+    console.info('[newsletter:dev] Confirm token received', { token: token.slice(0, 8) + '…' });
+    return Response.redirect(new URL(okPath, url).toString(), 303);
+  }
+
+  const db = getNewsletterDb(runtimeEnv);
+  if (!db) {
+    return new Response('Newsletter database binding NEWSLETTER_DB is not configured.', {
+      status: 500,
+    });
+  }
+
+  const row = await db
+    .prepare(
+      `SELECT * FROM newsletter_subscribers
+       WHERE confirm_token = ? AND status = 'pending'
+       LIMIT 1`,
+    )
+    .bind(token)
+    .first<NewsletterSubscriber>();
+
+  if (!row) {
+    return Response.redirect(new URL(failPath, url).toString(), 303);
+  }
+
+  await db
+    .prepare(
+      `UPDATE newsletter_subscribers
+       SET status = 'active',
+           confirmed_at = datetime('now'),
+           confirm_token = NULL
+       WHERE id = ?`,
+    )
+    .bind(row.id)
+    .run();
+
+  const resendApiKey =
+    readEnv('NEWSLETTER_RESEND_API_KEY', runtimeEnv) ||
+    readEnv('CONTACT_FORM_RESEND_API_KEY', runtimeEnv);
+  const fromEmail =
+    readEnv('NEWSLETTER_FROM_EMAIL', runtimeEnv) ||
+    readEnv('CONTACT_FORM_FROM_EMAIL', runtimeEnv);
+  const notifyTo =
+    readEnv('NEWSLETTER_NOTIFY_TO_EMAIL', runtimeEnv) ||
+    readEnv('CONTACT_FORM_TO_EMAIL', runtimeEnv);
+
+  if (resendApiKey && fromEmail && notifyTo) {
+    try {
+      await sendWithResend({
+        apiKey: resendApiKey,
+        fromEmail,
+        toEmail: notifyTo,
+        subject: 'Iscrizione newsletter confermata — NexStudio',
+        text: `L’indirizzo ${row.email} ha confermato l’iscrizione alla newsletter.`,
+      });
+    } catch (error) {
+      console.warn('[newsletter] confirm notify failed', error);
+    }
+  }
+
+  return Response.redirect(new URL(okPath, request.url).toString(), 303);
+};